The purpose of the design is to help promote Herbalife brand and identity.
While the use of green, black and white is to match Herbalife coporate identity, green colour also closely represent nature, freshness and health, which is similar to Herbalife identity, which is about healthy and active lifestyle. The use of black and white is to show contrast, to achieve the balance in the visual.
As for the use of wave graphic, it is because a powerful wave mean it is able to push forward regardless how strong the obstacles are, much like how Herbalife help one to achieve a healthy and confidence lifestyle, able to face everyday challenge.